Hybrid Self-Assembly during Evaporation Enables Drop-on-Demand Thin Film Devices

Boley, J. William; Hyun, Seok−Hee; White, Edward L.; Thompson, David H.; Kramer, Rebecca K.

doi:10.1021/acsami.5b12687

Cited by 12 publications

(13 citation statements)

References 31 publications

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“…This modeling work has provided critical and valuable hydrodynamic insight into the assembly of interface-bounded particles. However, one critical aspect about the colloidal particles might be missing; that is, the cluster assembly (small monolayer islands of particles at the interface) demonstrated in many experimental works ,,, has not been considered in this model. These monolayer clusters float and move at the interface as entities, possibly with different dynamics.…”

Section: Simulation Of Particle Dynamics and Assembly At The Interfacementioning

confidence: 99%

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New Perspective of Mitigating the Coffee-Ring Effect: Interfacial Assembly

Al‐Milaji

Zhao

2019

J. Phys. Chem. C

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The evaporation of particle-laden droplets on a substrate usually results in ring-like deposits due to particle migration to the contact lines. This ubiquitous phenomenon, known as the coffee-ring effect (CRE), was initially observed in drying coffee droplets and later in many colloidal systems. The CRE has been intensively investigated during the past two decades to unveil the complexity related to its flow patterns, evaporation physics, and deposition structures after solvent evaporation. However, the contribution of colloidal particle assembly and interactions at the air–liquid interface of sessile droplets to the particle deposition requires more attention. The objective of this Review Article is to highlight the recent advances in mitigating or totally suppressing the CRE by means of interfacial assembly via manipulating the multibody interactions, for example, particle–particle, particle–substrate, particle–flow, and particle–interface interactions. Well-ordered monolayer deposition of the colloidal particles, driven by interfacial assembly, has been demonstrated by several research groups. This unique perspective of suppressing the CRE and creating well-ordered monolayer structures by assembling colloidal particles at the air–liquid interface creates a new paradigm in generating coatings and functional devices through liquid processing. General rules and guidelines are established to provide broader prospects of engineering desirable structures of colloidal particle deposition and assembly.

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Section: Simulation Of Particle Dynamics and Assembly At The Interfacementioning

confidence: 99%

“…(b) Optical images showing the self-assembly of thiol-capped Ga–In nanoparticles at the air–liquid interface in a cosolvent system (water/ethanol mixture), presented in different stages of solvent evaporation. Reprinted with permission from ref . Copyright 2016 American Chemical Society.…”

Section: Particle Assembly At the Air–liquid Interfacementioning

confidence: 99%

New Perspective of Mitigating the Coffee-Ring Effect: Interfacial Assembly

Al‐Milaji

Zhao

2019

J. Phys. Chem. C

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“…Nanoscale particles attract a lot of attention due to their size‐dependent optical, [ 1 ] electrical, [ 2,3 ] and chemical properties. [ 4,5 ] Of particular interest are ultrasmall metal nanoclusters (or clusters), which experience strong quantum confinement effect leading to profound changes in the atomic packing structure.…”

Section: Introductionmentioning

confidence: 99%

Deposition of Extended Ordered Ultrathin Films of Au₃₈(SC₂H₄Ph)₂₄ Nanocluster using Langmuir–Blodgett Technique

Swierczewski

Maroni

Chennevière

et al. 2021

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Langmuir–Blodgett technique is utilized to deposit ultrathin films of Au38(SC2H4Ph)24 nanocluster onto solid surfaces such as mica and silicon. The morphologies of the films transferred at various surface pressures within the mono/bi/trilayer regime are studied by atomic force microscopy (AFM). The time spent on the water surface before the deposition has a decisive effect on the final ordering of nanoclusters within the network and is studied by fast AFM, X‐ray reflectivity, and grazing‐incidence wide‐angle X‐ray scattering.

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“…The active grains can be incorporated into a low‐viscosity solvent like ethanol or water to enable drop‐on‐demand printing, as shown in previous works, [ 64–66 ] or even arranged without any liquid external media (in air). However, here we focus on incorporating grains into an elastic medium to showcase the scalability and extrusion‐based 3D printability of the grains ( Figure ).…”

Section: Resultsmentioning

confidence: 99%

Soft Actuators Made of Discrete Grains

et al. 2022

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microscale actuation. However, these material-based actuators are often slow or only expand or contract axially, preventing use in applications that require volumetric expansions. To address such limitations of existing actuating materials, actuators based on the liquid-to-gas phase change of solvent inclusions encapsulated in a hyperelastic matrix have been realized. Phasechange actuators are capable of inducing rapid volumetric expansion similar to fluidic actuators, without being tethered to an external fluid source. [29][30][31][32] Accepting the advantages of phasechange actuators, we now turn our attention to granular media. Granular assemblies, consisting of discrete grains, can be tuned to accomplish a variety of different responses. For example, favorable self-assembly of granular media can be achieved via modulating interparticle interactions and external stimuli, [33][34][35][36] and granular assemblies with different packing configurations have been shown to yield different bulk properties. [36][37][38][39] Furthermore, granular media can exhibit optimized changes in stiffness during jamming transitions, enabling tunable moduli. [16,[40][41][42][43][44] When unjammed, the bulk material is compliant, and when jammed, the bulk material can achieve the stiffness of the grains. Finally, when mixed into carrier fluids, granular media can impart thixotropic behavior on the carrier fluid due to dynamic jamming, [45][46][47][48] enabling 3D printing of previously unprintable materials. With all the advantageous properties granular media has to offer, the technology has seen application in soft robotics, [49][50][51][52] medical devices, [53][54][55] flexible airfoils, [56] and programmable aggregate architecture. [57] Here, we bring together the unique advantages of phasechange soft actuators and granular media to introduce soft granular actuators made of discrete, volumetrically expanding grains. A single active grain consists of multiple solvent cores encapsulated in a hyperelastic silicone shell (Ecoflex 00-30). At elevated temperatures, the encapsulated solvent vaporizes and increases the internal pressure of the hyperelastic shell, inducing volumetric expansion of the grain. The grains are independently capable of rapid, high-force microscopic actuation, and are also easily arranged into granular assemblies to form larger-scale bulk actuators. Furthermore, agglomerates of active grains can self-assemble from disordered arrangements to conform around objects and exhibit variable moduli. Finally, the use of grains suspended in a carrier solvent or resin enables compatibility with granular self-assembly and 3D printing techniques, offering the potential to print volumetrically expanding actuators into freeform patterns across scales.Recent work has demonstrated the potential of actuators consisting of bulk elastomers with phase-changing inclusions for generating high forces and large volumetric expansions. Simultaneously, granular assemblies have been shown to enable tunable properties via different packing...

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Hybrid Self-Assembly during Evaporation Enables Drop-on-Demand Thin Film Devices

Cited by 12 publications

References 31 publications

New Perspective of Mitigating the Coffee-Ring Effect: Interfacial Assembly

New Perspective of Mitigating the Coffee-Ring Effect: Interfacial Assembly

Deposition of Extended Ordered Ultrathin Films of Au₃₈(SC₂H₄Ph)₂₄ Nanocluster using Langmuir–Blodgett Technique

Soft Actuators Made of Discrete Grains

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Hybrid Self-Assembly during Evaporation Enables Drop-on-Demand Thin Film Devices

Cited by 12 publications

References 31 publications

New Perspective of Mitigating the Coffee-Ring Effect: Interfacial Assembly

New Perspective of Mitigating the Coffee-Ring Effect: Interfacial Assembly

Deposition of Extended Ordered Ultrathin Films of Au38(SC2H4Ph)24 Nanocluster using Langmuir–Blodgett Technique

Soft Actuators Made of Discrete Grains

Contact Info

Product

Resources

About

Deposition of Extended Ordered Ultrathin Films of Au₃₈(SC₂H₄Ph)₂₄ Nanocluster using Langmuir–Blodgett Technique